Txhua leej txhua tus paub yuav ua li cas tiv thaiv PCB dabtsi yog khoov thiab board warping los ntawm reflow rauv. Hauv qab no yog ib qho lus piav qhia rau txhua tus:

1. Txo qhov cuam tshuam ntawm qhov kub thiab txias PCB pawg thawj coj saib kev nyuaj siab

Txij li thaum “kub” yog lub hauv paus tseem ceeb ntawm board kev ntxhov siab, tsuav yog qhov kub ntawm lub qhov cub reflow txo qis los yog tus nqi ntawm cov cua sov thiab cua txias ntawm lub rooj tsavxwm hauv lub qhov cub reflow yog qeeb, qhov tshwm sim ntawm phaj dabtsi yog khoov thiab warpage tuaj yeem ua tau zoo heev. txo. Txawm li cas los xij, lwm yam kev mob tshwm sim tuaj yeem tshwm sim, xws li solder luv Circuit Court.

2. Siv daim ntawv Tg siab

Tg yog lub iav hloov pauv kub, uas yog, qhov kub thiab txias ntawm cov khoom hloov ntawm lub khob iav mus rau lub xeev roj hmab. Qhov qis dua Tg tus nqi ntawm cov khoom siv, lub rooj tsavxwm tau nrawm dua tom qab nkag mus rau hauv qhov cub reflow, thiab lub sijhawm nws yuav siv sij hawm los ua cov roj hmab muag muag Nws tseem yuav ntev dua, thiab qhov deformation ntawm lub rooj tsavxwm yuav yog qhov hnyav dua. . Kev siv lub phaj siab dua Tg tuaj yeem ua rau nws muaj peev xwm tiv taus kev ntxhov siab thiab deformation, tab sis tus nqi ntawm cov khoom yog qhov siab.

3. Ua kom lub thickness ntawm lub rooj tsavxwm

Yuav kom ua tiav lub hom phiaj ntawm kev sib zog thiab thinner rau ntau yam khoom siv hluav taws xob, lub thickness ntawm lub rooj tsavxwm tau tso tseg 1.0mm, 0.8mm, lossis txawm tias 0.6mm. Xws li ib tug tuab yuav tsum ua kom lub rooj tsavxwm los ntawm deforming tom qab lub reflow rauv, uas yog heev nyuaj. Nws raug pom zoo tias yog tias tsis muaj qhov yuav tsum tau ua rau lub teeb thiab nyias, lub thickness ntawm lub rooj tsavxwm yuav tsum yog 1.6 hli, uas tuaj yeem txo qhov kev pheej hmoo ntawm kev khoov thiab deformation ntawm lub rooj tsavxwm.

4. Txo qhov loj ntawm lub rooj tsav xwm Circuit Court

Thiab txo tus naj npawb ntawm kev sib tw

Txij li feem ntau ntawm cov reflow furnaces siv chains los tsav lub Circuit Court board rau pem hauv ntej, qhov loj ntawm lub Circuit Court board yuav yog vim nws tus kheej hnyav, dent thiab deformation nyob rau hauv lub reflow furnace, yog li sim muab tso rau sab ntev ntawm lub Circuit Court board. raws li tus ntug ntawm lub rooj tsavxwm. Ntawm cov saw hlau ntawm reflow furnace, qhov kev nyuaj siab thiab deformation tshwm sim los ntawm qhov hnyav ntawm lub rooj tsav xwm Circuit Court tuaj yeem txo. Kev txo qis ntawm cov panels kuj yog raws li qhov laj thawj no. Qhov ntawd yog hais tias, thaum hla lub cub tawg, sim siv lub ntug nqaim kom dhau lub qhov cub kom deb li deb tau. Tus nqi ntawm kev nyuaj siab deformation.

5. Siv lub tshuab hluav taws xob siv hluav taws xob

Yog tias cov txheej txheem saum toj no nyuaj rau ua tiav, qhov kawg yog siv lub tshuab nqa rov qab / qauv los txo qhov deformation. Yog vim li cas vim li cas lub reflow carrier / template tuaj yeem txo qhov khoov ntawm lub phaj yog vim tias txawm tias nws yog thermal expansion lossis txias contraction, lub tais cia siab tias koj tuaj yeem kho lub rooj tsav xwm hauv Circuit Court thiab tos kom txog thaum qhov kub ntawm lub rooj tsavxwm Circuit Court qis dua Tg. tus nqi thiab pib tawv dua, thiab koj tuaj yeem tswj tau qhov loj ntawm lub vaj.

Yog hais tias ib txheej txheej pallet tsis tuaj yeem txo qhov deformation ntawm lub rooj tsavxwm Circuit Court, yuav tsum tau ntxiv ib lub hau rau clamp lub rooj tsavxwm nrog rau sab sauv thiab sab pallets. Qhov no tuaj yeem txo qhov teeb meem ntawm Circuit Court board deformation los ntawm reflow rauv. Txawm li cas los xij, qhov cub lub tais no kim heev, thiab nws yuav tsum tau muab tso rau hauv manually thiab rov siv dua.

6. Siv Router es tsis txhob V-Cut siv sub-board

Txij li thaum V-Cut yuav ua kom puas lub zog ntawm lub vaj huam sib luag ntawm lub rooj tsav xwm hauv Circuit Court, sim tsis txhob siv V-Cut sub-board lossis txo qhov tob ntawm V-Cut.